Control device



Sept. 12, 1939- A. VON WANGENHEIM CONTROL DEVICE Filed June 20, 1936 '2Sheets-Sheet 1 INVENTOR M MA TTORNEY P 1939. A. VON WANGENHEIM 2,172,823

I q CONTROL DEVICE Filed June 20, 1936 2 Sheets-Sheet 2 LU INVENTOR gffiw MK M M A TTORNEY Patented Sept. 12, 1939 PATENT OFFICE CONTROL DEVICEAdolf von Wangenheim, Detroit, Mich., assignor to Detroit LubricatorCompany, Detroit, Mich.,

a corporation of Michigan Application June 20,

17 Claims.

My invention relates generally to temperature responsive devices andmore particularly to temperature responsive, circuit breaking devices.

One of the objects of my invention is to pro- 5.- vide a new andimproved device for preventing overheating of a heating apparatus in theevent that the boiler water level decreases below a predetermined level.

Another object of my invention is to provide a device of the abovementioned character that will operate at a given time following decreaseof the boiler water level to a predetermined level.

Another object of my invention is to provide a circuit breaking deviceoperable in response to a predetermined temperature and one which willnot be affected by heat generated by electric current of the circuit tobe controlled.

More specifically it is an object of my invention to provide atemperature responsive, circuit breaking device in which a fusible meansacts to maintain the circuit closed below a predetermined temperature,and to provide a device of this character in which the current does notflow through the fusible means so that the fusible means will not beaffected by current generated heat.

Another object of my invention is to provide a device of the abovementioned character of new and improved construction to preventconduction of heat away from the fusible means, via the metallic partsof the device.

The invention consists in the improved construction and combination ofparts, to be more fully described hereinafter and the novelty of whichwill be particularly pointed out and dis- 5 tinctly claimed.

' In the accompanying drawings, to be taken as a part of thisspecification, I have fully and clearly illustrated my invention, inwhich drawlugs- Figure l is a view of my device shown in longitudinalcentral cross section;

Fig. 2 is a view shown in transverse cross section of my device andtaken along the line 2-2 of Fig. 1;

Fig. 3 is a view partly in cross section of an end portion of my deviceshowing the circuit controlling means in open circuit position;

Fig. 4 is a view shown in transverse cross section of my device andtaken along the line 44 of Fig. 1;

Fig. 5 is a view shown in transverse cross section of my device andtaken along the line 55 of Fig. 3;

Fig. 6 is a view in elevation of a heating apparatus showing one mannerin which my tempera- 1936, Serial No. 86,309

ture responsive, circuit breaking device may be associated in heattransfer relation with a heating apparatus, and

Fig. 7 is a view similar to Fig. 6 showing another manner in which mydevice may be associated in heat transfer relation with a heatingapparatus.

Referring to the drawings by characters of reference and moreparticularly to Fig. 1, my control device includes a hollow bodyportion, or fitting I that is preferably a'casting having oppositelydisposed end Walls 2 and 3, and a side wall preferably formed havingexternal and oppositely disposed tubular bosses 5 and 6. The tubularbosses 5 and 6 define inlet and outlet passages 1 and 8, respectively,that open into the body l, and these bosses may be internally threadedfor connection in a fluid flow line to be hereinafter described. The endwall 2 of the body I is preferably formed having an extended wallportion or boss ll] of tubular form that projects into the interior ofthe body toward the opposite end wall 3. The tubular boss l0 defines abore, or passage II that opens at one end through the outer face of theend wall 2. At its inner end the tubular projection II) has an end walll2 disposed adjacent the opposite end wall 3, and in the end wall I2there is provided an opening, or aperture 13 therethrough that registersor overlies a larger opening l4 provided in the opposite end wall 3 ofthe body I,

Carried by the body I there is a casing in the form of a tube, or sleevemember [5 that extends through the aligned openings l3 and M in theopposite end walls of the body and has an open end that positions withinthe passage 1 I defined by the tubular extension In. At its open end thetube 15 is preferably formed having an outturned annular flange [6 forseating against the inner wall surface of the end wall !2 of the tubularextension 10. The tube I5 projects externally of the body I and itsouter end is closed. Preferably the tube 15 is formed of thin sheetmetal. A gasket [1 is provided between the inner surface of the end wall12 and the annular flange it of the tube l5, and this gasket ispreferably formed of a material having low heat conductivity, such asrubber, to prevent conduction of heat between the tubular member and thebody, for a purpose to be hereinafter described. The bore or passage IIof the tubular extension I0 is preferably threaded to receive a tubularshaped compression member or packing nut l8 that is externally andinternally threaded. The inner end of the compression member I8preferably abuts a metallic washer l9, and between the washer and theannular flange E of the tubular member Hi there is provided a secondgasket Zil of low heat conductivity for sub stantially preventingconduction of heat between the tube i5 and the body i via the washer I9and compression member i8. When the compression member is tighteneddown, the tube 5 will be secured to the body i and the gaskets H and 2%will be compressed to seal the opening it in a fluid-tight manner, aswell as serving to prevent the conduction of heat between the tube 55and body it.

The end wall 3 of the body I is preferably formed having an externaltubular boss, or extended tubular shaped wall portion 2i that surroundsthe opening M in the end wall 3. The inner wall surface of the tubularextension M is preferably spaced from the wall defining the opening i lso as to have a portion of the outer wall surface of wall 3, around theopening M, within the tubular boss 2| to serve as a seating surface, asat 22. Surrounding the tubular member i5 there is a second and outertubular member, or sleeve 23 that extends longitudinally of and fits ortelescopes tightly over the inner tubular member I?) in good heattransfer relation therewith. The outer tube like the inner tube I5, ispreferably formed of thin sheet metal. The outer tube 23 has an open endthat projects into the tubular boss 2! of end wall 3 and overlies orregisters with the opening [4 through wall 3. At its inner end the outertube 23 is formed having an outturned annular flange 24 for seatingagainst the wall 22 surrounding the opening M, the other, or outer endof the tube 23 being closed and disposed in spaced relation to the outerclosed end of the inner tube !5 to provide a space 25 between the endsof the tubes. Between the annular flange 24 and the end wall 3 of thebody 8 there is provided a which, like the previously mentioned gaskets,is of a low heat conducting material, such as rubber, to preventconduction of heat between the outer tube 23 and the body I. The tubularboss 23 is preferably internally threaded to receive an externallythreaded compression member, or packing nut 27 of tubular form thatsurrounds the outer tube and threads into the boss 2! for curing theouter tube 23 to the body and for compressing the gasket 26 to seal theopening l4 wall I; a fluid-tight manner. Preferably the inner end of thecompression member 27 abuts a metallic washer 28, and between the washerand the annular flange 24 of the outer tube 23 there is provided asecond gasket 29 of low heat conducting material to prevent conductionof heat between the tube 23 and the body 5 via the washer 28 andcompression member 2?. The outer tube 23 is formed having outwardlyextending bent portions 36 providing two oppositely disposed channelsthat extend longitudinally and substantially coextensive of the tube 23and cooperate with the outer surface of the inner tube 85 to provideclosed passages 3!. The passages 35 communicate with the interior of thebody l, and communicate with each other through the space 25 between theclosed spaced ends of the tubes, providing a closed system for a coolingfluid.

Disposed within and extending longitudinally of the inner metallic tubeI5 there is a detachable tubular shaped member 35 formed of electric andheat insulating material, which may be porcelain. The porcelain tube 35extends through the tubular shaped compression member E8 and preferablyhas an enlarged outer end portion 36 that projects externally of thebody l. Carried by and fixed to the porcelain tube 35 there is ametallic sleeve 3i that surrounds an outer end portion of the porcelaintube, the sleeve 3'5 hav a reduced inner end portion that is externallythreaded for screw threading into the tubular compression member it toprevent longitudinal movement of the porcelain tube. The outer end ofthe porcelain tube 35 is preferably closed by an end wall 38 and theinner end of the tube is preferably open and spaced from the closed endof the surrounding metal tube 15 to provide a heating chamber, or space39 for a purpose to be hereinafter described.

Disposed within and carried by the porcelain tube 35 there is a pair ofcooperable electric current conductor members, or arms 68 and M thatextend longitudinally of the tube 35. The conductor members ii? and iiare preferably rectangular shaped rods formed of a metal having a lowresistance to flow of current, and these rods are disposed in spacedrelation and extend in the same general direction, or substantiallyparallel to each other. The rods iii and M have end portions thatproject externally of the porcelain tube 35 through spaced apertures inthe closed end wall of the tube. In the side wall of the enlargedportion adjacent the end wall apertures are provided for receivingscrews that thread into apertures in the conductor members ii] and ll tosecure the cooductor members to the porcelain tube 35 and preventlongitudinal movement of the conductor members.

A sheet metal sleeve member, or can is preferably provided and fitted ortelescoped over an inner end portion of the porcelain tube 35, thesleeve 153 preferably having an end wall Ml that abuts the inner end ofthe porcelain tube and preferably fits tightly within casing .5 in. goodheat conducting relation therewith. Outward longitudinal movement of thesleeve member 43, relative to the porcelain tube may be prevented byproviding the porcelain tube with annular groove, or slot, around itsouter periphcry and bending an end portion of the inner end of thesleeve inwardly to position in and engage with a side wall of the slot.Formed out of the end wall 4 1 of the sleeve 43 there is a tab or lug itthat is bent so that it projects forwardly from the end wall a llongitudinally of the sleeve, into the heating chamber 39 toward the endwall of the inner metallic tube Q5. The conductor memand ll c arrangedin ovcrlying relation to each other, and the lower conductor member l!terminates within and adjacent the inner end of the porcelain tube 35.

The upper conductor member 1i) has an end portion ll that projectsbeyond the inn-er end of the conductor member 4! and projects externallyof the porcelain tube 35 and sleeve 53, into the heating chamber 35through the opening resulting from the forming of the tab M3 out of theend wall M of the sleeve or cap 43. Carried by the conductor member li,adjacent its inner end within the porcelain tube 35, there is an upward-1y extending electric contact member 48 that is adapted to engage asimilar and downwardly ex tending contact member 59 carried by theconductor member MB to complete an electric circuit. When the contactmembers 48 and 19 are in engagement, as shown in Fig. 1, the metallicconductor member 40 is under stress acting to move upward and away fromthe conductor member 4|, and the lower conductor member 4| is also understress acting to move upward or follow the upper conductor member 40. Asshown in Fig. 5, the inner side walls of the porcelain tube 35 arepreferably provided with oppositely disposed, longitudinally extendingslots 48 located at the bottom wall and inner end of the tube 35 toprovide downwardly facing shoulders 48*. An inner end portion of thelower conductor member 4| is enlarged and positions beneath theshoulders 48 for engagement therewith to limit upward movement of theend of conductor member 4| and its contact member 48 carried thereby.

Secured to the inner end portion 41 of the conductor member there is anextension arm 58 which may be formed out of a plate, and formed havingoppositely disposed ears, or tabs 5| that may be wrapped or bent aroundthe end portion 41 of the conductor member to secure the extension arm58 to the conductor member. Surrounding the end portion 41 of theconductor member 40, between the end portion 41 and the extension arm50, there is provided electric and heat insulating material 52 that maybe mica, or other suitable material for insulating the current conductormember 40 from its extension arm 50. The insulation 52 may be wrappedaround the end portion 4'! of the conductor member 49, and end portionsof the insulating material may be clamped between the ends of the tabs5|, as shown in Fig. 4. The extension arm projects into the heatingchamber 39 toward the end wall of the inner metallic tube l5, andoverlies the tab or lug 46 in close proximity thereto when the contactmembers 48 and 49 are in engagement with each other, as shown in Fig. l.The conductor members or rods 40' and 4| are normally held under stresswith their contact members 48 and 49 in engagement by a fuse member,designated in general by the numeral 54. The fuse member 54 preferablycomprises a pair of polysided sleeve members 55 joined, or securedtogether by fusible material which may be solder, indicated at 56, thesleeve member slip-fitting over the extension arm 58 and the fixed arm,or lug 46. The fuse member 54 is thus positioned within the heatingchamber 39 and is responsive to the temperature of the surroundingportion of the metallic tube IS. The member 43 serves as an anchor forthe fuse member 54 and conducts heat from the casing l5 direct to thefuse so that the temperature of the fusible material 56 will besubstantially the same as the temperature of the casing I5.

Mounted on the outer end of the porcelain tube 35 there is aconventional type of electrical fitting 58 of electric insulatingmaterial that abuts the outer end of the porcelain tube 35 and has theusual sockets 59 for receiving the externally projecting outer endportions of the conductor members 49 and 4|. The electric insulatingfitting 58 is preferably carried by a metallic fitting 66 that surroundsthe same and has an ex tended sleeve portion 6|, an end portion of whichfits or telescopes over the enlarged end of sleeve 31 to hold thefittings thereto. The fitting 69 has a reduced and externally extendingtubular portion that is preferably internally threaded to receive anexternally threaded end portion of a tubular shield 6| for shieldinglead wires 62 and 63 that extend therethrough and connect to the sockets59 of the inner fitting 58. The other ends of the lead wires 62 and 63may be connected to ing fuel to a heat apparatus so that when thecontacts 48 and 49 are parted the motor will be deenergized and thesupplying of fuel to the heating apparatus discontinued.

Referring now to Fig. 6 there is shown a heating apparatus, or furnace65 having the usual outlet stack 65 for the passage of the products ofcombustion to a chimney (not shown). As one manner of installation, mydevice may be secured in and to the wall of the stack 66 with themetallic tubular end of the device projecting into the stack 66. Thestack 66 may be provided with an aperture in its side wall to receivethe tubular end of the device and the compression member 21, which alsohas an end portion that projects into the stack and receives a nut 61for rigidly securing the device to the stack 66. Surrounding thecompression member 21 and disposed on opposite sides of the wall of thestack 66 there are gaskets 68, Fig. l, which are preferably formed ofrubber, or formed of other suitable heat insulating material forinsulating the body I from the stack 65. When the nut Bl is tightened,the gaskets 68 will be compressed and will seal the opening in the wallof the stack 66 in a fluid-tight manner. Secured in the upper threadedboss 5 of the body, or fitting I, is one end of a pipe or conduit iii,the other end of which conduit is secured in and to the wall of theboiler of the furnace 65 at a point above the normal water level,indicated at H. Secured in the lower threaded boss 6 of the body, orfitting I there is one end of a pipe or conduit 12, the other end ofwhich conduit is secured in and to the wall of the boiler or furnace 65at a point below the low water level, designated at I The upper pipe I6is preferably connected to the boiler above the normal high water levelto prevent circulation of the water by gravity through the passageways3| which would otherwise result in heat being carried away from themetallic tubes surrounding the fuse member 54.

In 7 there is shown a manner of installing my temperature responsivedevice in connection with the type of furnace that has the stack leadingout of the top wall thereof, and consequently above the normal or highwater level. In installing my device in the above-mentioned type offurnace, the tubular end of the device containing the fusible materialis preferably inserted into the furnace, or boiler, through an apertureprovided in a wall 14 of the frame for the furnace cleanout door,indicated at 15. The body, or fitting is connected by upper and lowerpipes or conduits 15 which are secured in and to the wall of the boilerat points above and below the high and low water levels, respectively.Connecting the upper and lower conduits 16 there may be provided theusual water gauge or glass tube, as at H.

The operation of my temperature responsive, circuit breaking device asfollows: When the level of the water in a boiler is such that waterstands in the passages 3| and 25 between the inner and outer metallictubes i5 and 26, the tubes will be prevented from reaching a temperaturewhich would cause the fusible material to fuse. If the water in theboiler decreases to a level such that water no longer stands in thepassages 3| and 25, then the temperature of the tubes @5- and 23 willincrease and the fusible material 56, in the chamber 39 of the innertube 55, will fuse at a predetermined temperature. When the fusiblematerial 56 fuses, the inner binding posts of a motor (not shown) forsupplyend of the upper conductor member 40 being under stress will moveupwardly, and the inner end of the lower conductor member 41 also beingunder stress will move upwardly or follow the upper conductor memberuntil it engages its stop or shoulder 48 The upper conductor member towill continue to move upward after the lower conductor member 4| hasengaged its stop 48'" and the contact members 48 and 49 will then beparted, opening circuit to the fuel supply apparatus. Upward movement ofthe inner end of the upper conductor member 40 will be limited byengagement with the upper inner wall of the porcelain tube 35. To resetthe conductors in circuit making position it is only necessary to removethe porcelain tube 35, and associated parts that may be slid out of tube5 as a unitary structure, after which the conductor members may be heldwith their contact members in engagement while a new fuse holding memberis slipped over the ends of the fixed lug 45 and the extension arm 50 ofthe conductor member 40. By having the lower conductor member 4| understress such that its inner end tends to move upwardly toward the upperconductor member 49, it will be seen that the contacts 48 and 49 will beheld in tight engagement and arcing of the contacts will be prevented.

From the foregoing description it will now be seen that I have provideda new and improved temperature responsive, circuit breaking device soconstructed that the temperature responsive means is not affected bycurrent generated heat in the circuit. In regard to this point, it willbe appreciated that if the current were to flow through the fusibleholding means of the device the current would generate heat in thefusing material, which would tend to cause the material to fuseprematurely. Furthermore, I have provided a temperature responsive,circuit breaking device of such new construction as to prevent theconduction of heat away from the holding fusible material so that thefusing material will fuse within a short time period after the waterleaves the passages SI and 25. In regard to this point it will be seenthat if the tubes l5 and 23 were not insulated from the body I, thatheat would be conducted away from the fusing material with the resultthat a relatively higher temperature would have to be reached in thefurnace before the fusible material would fuse and break the circuit.

What I claim and desire to secure by Letters Patent of the United Statesis:

l A circuit controlling device comprising a pair of contact carryingmembers with at least one of said members being under stress acting tomove away from the other of said members, contactscarried by saidmembers and cooperable to make and an electric circuit, a fixed armmember separate from said contact members, means carried by the movableone of said con tact members and overlying said fixed arm member andfusible material fusible in response to a predetermined temperature andfusing said carried means to said arm member so that said contacts areheld in engagement at temperatures below predetermined temperature.

2. A circuit controlling device comprising a pair of current conductingcontact carrying members with at least one of said members being understress acting to move away from the other of said members, contactscarried by said members and cooperable to make and break an. electriccircuit through said members, a fixed arm member separate from saidcontact members,

fusible material fusible in response to a predetermined temperature andholding the movable one of said contact members to said fixed arm memberwith said contacts in engagement at temperatures below saidpredetermined temperature, and means carried by said movable con tactmember and electrically insulating said arm member so that current flowfrom the movable one of said contact members will be interrupted.

3. A circuit controlling device comprising a pair of current carryingconductor members cooperable to make and break an electric circuit, atleast one of said members being under stress and acting to move relativeto the other of said members to control the circuit, an extension membercarried by he movable one of said members, means electrically insulatingsaid extension member carried by the movable one of said memtensionmember separate from said conductor members and cooperable with saidfirst-named extension member, a fusible holding means removably securedto said first-named and said second-named extension members and holdingsaid conductor members in relatively fixed relation at temperaturesbelow a predetermined temperature.

4. In a temperature responsive control device, a body having an inletand an outlet for flow of fluid and having an opening in a wall thereof,a tubular member, fluid conducting means cooperable with said tubularmember and in communication with said opening for the passagetherethrough of fluid thereby to cool said tubu lar member, controlmeans disposed within and responsive to the temperature of said tubularmember, means securing said tubular member to said body, and heatinsulating means between said tubular member and said body to preventtransfer of heat therebetween by conduction.

5. In a temperature responsive control device, a hollow body portionhaving an inlet and an outlet for fluid and having overlying openings inoppositely disposed walls thereof, a tubular member extending throughsaid openings, means for securing one end of said tubular member to oneof said oppositely disposed walls, said tubular member extending throughsaid hollow body and projecting externally thereof through the openingin the other of said oppositely disposed walls, heat insulating meansfor preventing conduction of heat between said tubular member and saidbody portion and also serving to seal the opening in said one wall, asecond tubular member, said second-named tubular member surrounding saidfirst-named tubular member and having an open end registering with theopening in the other of said oppositely disposed walls, saidsecond-named tubular member cooperating with said first-named tubularmember to provide a passage for fluid in communication with said hollowbody, means for securing said second-named tubular member to said otherwall, heat insulating means for preventing conduction of heat betweensaid second-named tubular member and said body portion and also servingto seal the opening in the other of said walls, and temperatureresponsive control means within said first-named tubular member andresponsive to the temperature thereof.

6. A circuit controlling device comprising a pair of stressed movablecurrent conductor members cooperable to make and break an electriccircuit, fusible means acting to hold said con ductor members in closedcircuit position, said conductor members having common initial movementupon fusing of said fusible means, and means operable when saidconductor members are in engaged motion to interrupt movement of one ofsaid members so that said members will separate with a quick action.

7. A circuit controlling device comprising a pair of flexible resilientcturent-conducting members cooperable to make and break an electriccircuit, said flexible members being under stress and each of saidmembers. acting to move in the same general direction, fusible meansholding said flexible members in engagement, one of said flexiblemembers having limited movement so that said members will be partedquickly to open the circuit after common mcvement in one direction uponfusing of said fusible means.

8. A circuit controlling device comprising a pair of contact carryingmembers, contacts carried by said members and cooperable to make andbreak an electric circuit, one of said members being under stress actingto move away from the other of said members to break the circuit, saidother of said members being under stress acting to move in the samegeneral direction as said one member to urge the contact carried by saidother member toward the contact carried by said one member, yieldab-lereleasable means for holding said members against relative move ment,and stop means limiting movement of said other member subsequent torelease of said members so that said contacts can part to open thecircuit with a quick action.

9. In a temperature responsive control device, a body having an inletand an outlet for liquid, said body also having oppositely disposedwalls with one of said walls having an, opening therethrough, a casingmember carried by said body and projecting thereinto through the openingin said one wall, said casing member being secured at its periphery tothe other of said walls, a second casing member surrounding saidfirst-named casing member and secured at its periphery to said one wall,said casing members cooperating to provide a passage for liquid incommunication with the interior of said body, and temperature 4responsive control means within said first-named casing member.

10. In a temperature responsive control device, a body having an inletand an outlet for liquid, said body also having oppositely disposedwalls with one of said walls having an opening therethrough, a tubularmember having an open end projecting into said body through saidopening, means for sealing and securing said tubular member at its openend to the other of said walls, a second tubular member fitted over saidfirstnamed tubular member in heat conducting relation thereto andclosing the opening in said one wall, said second-named tubular memberhaving an open end disposed toward said one wall, means for sealing andsecuring said secondnamed tubular member at its open end to said onewall, said tubular members cooperating to provide a passage for liquid,and temperature responsive control means within said first-named tubularmember.

11. In a temperature responsive control device, a body having an inletand an outlet for liquid, said body also having oppositely disposedwalls with one of said walls having an opening therethrough, a tubularmember projecting into said body through said opening and secured at oneend to the other of said walls, a second tubular member fitted over saidfirst-named tubular member in heat conducting relation therewith, saidsecond-named tubular member closing said opening in said one wall, meansfor securing said second-named tubular member at one end thereof to saidone Wall, said tubular members cooperating to provide a chamber forliquid, said chamber extending longitudinally of said tubular membersand communicating with the interior of said body, a tubular member ofelectric insulating material disposed in said first-named tubularmember, switch means disposed within said third-named tubular member andincluding a movable member projecting into said first named tubularmember, said switch means acting to open a circuit, and fusible materialholding said movable mem er in closed circuit position at temperaturesbelow a predetermined temperature, said fusible material being disposedin and responsive to the temperature of said firstnamed tubular member.

12. In a switch, a movable conductor having a contact, a contact membercooperable with said contact, said conductor being tensioned to move itscontact relative to said contact member, a casing to be heated andenclosing said conductor and said contact member, a fusible elementsecured to said conductor, and means anchoring said element to saidcasing to hold said conductor under tension, said means being of heatconducting material and serving to transmit heat from said casing tosaid fusible element.

13. In a switch, a movable electric conductor, a contact membercooperable with said conductor to control an electric circuit, a casingto be heat-- ed and enclosing said conductor and said contact member, ananchor of heat conducting material in contact with said casing, afusible element holding said conductor to said anchor, said conductorbeing held in one position relative to said contact member and movablerelative thereto on fusing of said fusible element, said anchorconducting heat from said casing to said fusible element, and electricinsulating material interrupting flow of current between said fusibleelement and said casing.

14. In a circuit controlling device, a body having an inlet and anoutlet for liquid, a casing having a closed end and having a jacket forliquid, said jacket communicating with the interior of said body, aremovable tubular member of electric insulating material positioned insaid casing, a heat conducting tubular member carried by saidfirst-named tubular member with its wall overlying said jacket, saidsecond-named tubular member fitting into said casing in contact with theinner wall surface thereof, said second-named tubular member having oneend spaced from the said end wall of said casing to provide a chamber,switch means in said firstnamed tubular member including a movablemember operable to open a circuit, said movable member projecting intosaid chamber, said sec ond-named tubular member having an extendedportion in said chamber extending in the same general direction as saidmovable member, fusible material in said chamber and holding saidmovable member under stress to said extended portion at temperaturesbelow a predetermined temperature, and electric insulating materialinterrupting flow of current between said fusible material and saidcasing.

15. In a temperature responsive control device, a body having an inletand an outlet for flow of fluid and having an opening in a wall thereof,a tubular member, fluid conducting means cooperable with said tubularmember and in communication with said opening for the passagetherethrough of fluid thereby to cool said tubular member, temperatureresponsive control means disposed within and having direct conductionheat exchange contact with the Wall of said tubular member, meanssecuring said tubular member to said body, and heat insulating meansbetween said tubular member and said body to prevent transfer of heattherebetween by conduction.

'15. A temperature responsive control means comprising a tubular housingmember, means to cool said member, a pair of current conductor memberspositioned within said housing member, one of said conductor membersbeing under stress and movable to make and break circuit with the otherof said conductor members, supporting means Within and in heat exchangerelation with the Wall of said housing member, and temperatureresponsive means securing the mov-- able one of said conductor membersto said sup porting means, said supporting means having guide means forthe movable one of said conductor members.

1'7. A temperature responsive control means comprising a tubular housingmember, means to cool said member, a tubular member of insulatingmaterial Within and extending longitudinally of said housing member, apair of current conductor members positioned Within said tubularinsulating member, one of said conductor members being under stress andmovable to make and break circuit with the other of said conductormembers, a sleeve member having an end Wall and secured on saidinsulating member and having heat exchange relation With the wall ofsaid housing member, and temperature responsive means securing themovable one of said conductor members to said sleeve member, said sleevemember end Wall having a guide slot receiving the movable one of saidconductor members.

ADOLF VON WANGENI-IEIM.

CERTIFICATE OF CORRECTION.

Patent No 2,172,825

September 12, 1959 ADOLF Von WANGENHEIM.

It is hereby certified that error appears in the printed specificationof the above-numbered patent requiring correction as follows; Page isec- 0nd column, line 16, claim5, for "he" read the; lines 18 and 19,same claim,

for "carried by the movable one of said memtension member" read from itsconductor member, a fixed extension member;

and that the'said Letters Patent shouldbe read with this correctiontherein that the same may conform to the record of the case in thePatent Officen Signed and sealed this loth'day of October, A. D. 19 9.

(Seal) Henry Van Arsdale,

Acting Commissioner of Patents.

